There's some bargains to be had.
I sold my twenty year old PSR1000 and stand on e-Bay (using floppy discs on which to record was a bit antiquated) and bought a Tyros 5 with the speakers from a music store chain on e-Bay. This was three weeks ago. It came with free postage. (The purchaser of my PSR 1000 had to pay £46 for the carriage when I sent it to them).
The Tyros was advertised as second-hand, but there wasn't a mark on it. It's immaculate as are the speakers. Not only that, I found it had never been registered with Yamaha as having been sold.
Because they'd used a generic photo of one in one of their their showrooms without declaring such, as the photo showed it on a stand, I made them give me a stand with it.
It would appear that even some retailers aren't aware of the eBay rules.
I thought £1600, with the speakers, a stand, free postage and a two year guarantee, a fair price, I'm well pleased with it. I've given them a "five star rating."
I would imagine there's a few "demo" Tyros 5s around in showrooms now which they want to clear.